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Agilent Technologies
U1251A manual
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185 pages, 4.42 Mb
Agilent Technologies
Agilent U1251A and
U1252A
Handheld Digital
Multimeter
User’s and Service Guide
Contents
Main
Notices
Manual Part Number
Edition
Technology Licenses
Restricted Rights Legend
Safety Symbols
Page
Page
Page
Agilent U1251A/U1252A Users and Service Guide VII
Regulatory Markings
Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC
Do not dispose in domestic household waste
In This Guide
Page
Contents
1 Getting Started
2 Making Measurements
3 Functions and Features
4 Changing The Default Setting
5 Maintenance
6 Performance Tests and Calibration
7 Specifications
Page
Page
List of Figures
Page
List of Tables
Page
1 Getting Started
Introducing the U12521A/U1252A Handheld Digital Multimeter
Check the shipment
Adjusting the tilt-stand
Page
Page
The rear panel at a glance
The rotary switch at a glance
The keypad at a glance
10 Agilent U1251A/U1252A Users and Service Guide
1 Getting Started Tutorial
The display at a glance
12 Agilent U1251A/U1252A Users and Service Guide
1 Getting Started Tutorial Tabl e 1 -3 General display symbols
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Page
Page
Selecting display with the Hz button
V
Page
Selecting display with the Dual button
V
Page
Selection display with the Shift button
V
Page
The terminals at a glance
2 Making Measurements
Understanding The Measurement Instructions
Measuring Voltage
Measuring AC voltage
Page
Measuring Current
A & mA measurement
Page
Percentage scale of 4 mA to 20 mA
Page
A (ampere) measurement
Frequency Counter
Page
Measuring Resistance, Conductance and Testing Continuity
Page
Audible continuity
Conductance
Page
Tes ti ng Dio de s
Page
Page
Measuring Capacitance
Page
Measuring Temperature
Page
Page
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Alerts and Warning During Measurement
Overload alert
Input warning
Charge terminal alert
3 Functions and Features
Dynamic Recording
Page
Data Hold (Trigger Hold)
Refresh Hold
Page
Null (Relative)
Page
Decibel Display
Page
1 ms Peak Hold
Page
Data Logging
Manual logging
Page
Interval logging
Page
Reviewing logged data
Page
Square Wave Output (for U1252A)
Page
Page
Page
Remote Communication
Page
4 Changing The Default Setting
Selecting Setup Mode
Changing The Default Setting 4
Agilent U1251A/U1252A Users and Service Guide 75
Table 4-1 Available setting options in Setup mode
76 Agilent U1251A/U1252A Users and Service Guide
4 Changing The Default Setting
Table 4-1 Available setting options in Setup mode (continued)
Setting Data Hold/Refresh Hold Mode
Setting Data Logging Mode
Page
Setting Reference Impedance for dBm Measurement
Setting Minimum Frequency Measurement
Setting Temperature Unit
Page
Setting Auto Power Saving Mode
Page
Page
Setting Beep Frequency
Setting Backlight Timer
Setting Baud Rate
Setting Parity Check
Page
Page
Setting Print Mode
Press
Returning to Default Factory Settings
Press
5 Maintenance
Introduction
General maintenance
Battery replacement
Page
Storage considerations
Charging the battery
Page
Page
Page
Page
Page
Page
Fuse checking procedure
Replacing the fuse
Page
Troubleshooting
Replaceable Parts
To order replaceable parts
Page
6 Performance Tests and Calibration
Calibration Overview
Closed-case electronic calibration
Agilent Technologies calibration services
Calibration interval
Adjustment is recommended
Recommended Test Equipment
Basic Operating Test
Current terminal test
Charge terminal alert test
Test Considerations
Calibration Security
Performance Verification Tests
Agilent U1251A/U1252A Users and Service Guide 121
Tabl e 6 -2 Performance verification test steps
Error from nominal 1 year
122 Agilent U1251A/U1252A Users and Service Guide
Error from nominal 1 year
Agilent U1251A/U1252A Users and Service Guide 123
Error from nominal 1 year
124 Agilent U1251A/U1252A Users and Service Guide
Error from nominal 1 year
Agilent U1251A/U1252A Users and Service Guide 125
Error from nominal 1 year
126 Agilent U1251A/U1252A Users and Service Guide
Error from nominal 1 year
Page
Unsecuring the instrument for calibration
To Un se cu re t he In st rum ent from the Front Panel
To change the instrument calibration security code from the front panel
To unsecure the instrument without the security code
Calibration process
Using the front panel for adjustments
Selecting the Adjustment Mode
Entering Adjustment Values
Adjustments Consideration
Valid adjustment input values
V
Adjustment procedure
Page
Agilent U1251A/U1252A Users and Service Guide 137
Tabl e 6 -4 Adjustment table
138 Agilent U1251A/U1252A Users and Service Guide
Agilent U1251A/U1252A Users and Service Guide 139
140 Agilent U1251A/U1252A Users and Service Guide
Agilent U1251A/U1252A Users and Service Guide 141
Finishing the adjustment
To read the calibration count
Calibration errors
Page
7 Specifications
146 Agilent U1251A/U1252A Users and Service Guide
Product Characteristics
Agilent U1251A/U1252A Users and Service Guide 147
Page
Measurement Category
Measurement category definition
Measurement CAT I
Measurement CAT II
Measurement CAT III
Specification Assumptions
Agilent U1251A/U1252A Users and Service Guide 151
Electrical Specifications
DC Specifications
Tabl e 7 -1 DC Accuracy (% of reading + Number of Least Significant Digit)
152 Agilent U1251A/U1252A Users and Service Guide
Tabl e 7 -1 DC Accuracy (% of reading + Number of Least Significant Digit) (continued)
Agilent U1251A/U1252A Users and Service Guide 153
AC Specifications
AC specifications for U1251A
Tabl e 7 -2 U1251A accuracy specifications (% of reading + number of LSD) for true RMS AC voltage
Tabl e 7 -3 U1251A accuracy specifications (% of reading + number of LSD) for true RMS AC current
154 Agilent U1251A/U1252A Users and Service Guide
AC specifications for U1252A
Tabl e 7 -4 U1252A accuracy specifications (% of reading + number of LSD) for true RMS AC voltage
Tabl e 7 -5 U1252A accuracy specifications (% of reading + number of LSD) for true RMS AC current
Agilent U1251A/U1252A Users and Service Guide 155
AC+DC Specifications for U1252A
Tabl e 7 -6 U1252A true RMS ac+dc voltage specifications
Tabl e 7 -7 U1252A true RMS ac+dc current specifications
156 Agilent U1251A/U1252A Users and Service Guide
Capacitance Specifications
Temperature Specifications
Tabl e 7 -8 Capacitance specifications
Tabl e 7 -9 Temperature specifications
Frequency Specifications
Duty Cycle and Pulse Width Specifications
Table 7-10Frequency specifications
Table 7-11Duty cycle and pulse width specifications
Frequency Sensitivity Specifications
For voltage measurements
Table 7-12Frequency sensitivity and trigger level specificati ons for voltage measurements
For current measurements
Peak Hold Specifications
160 Agilent U1251A/U1252A Users and Service Guide
Frequency Counter Specifications for U1252A
Table 7-15Frequency counter (divide by 1) specifications
Table 7-16Frequency counter (divide by 100 [4]) specificati ons
Agilent U1251A/U1252A Users and Service Guide 161
Square Wave Output for U1252A
Table 7-17Square wave output specifications
Operating Specifications
Display update rate (approximate)
Agilent U1251A/U1252A Users and Service Guide 163
Input impedance
Table 7-19Input Impedance
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Printed in Malaysia Tenth Edition, May 4, 2012 U1251-90003
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